Paper post-processing device

Abstract

A paper post-processing device includes: a base tray 112 configured to stack paper transferred from an image-forming device; a paper transferring unit including a paper gripper configured to grip a rear end of a paper bundle stacked on the base tray 112 , a paper transferring unit configured to transfer the paper gripper; and a stacker tray 103 configured to stack paper transferred from the paper transferring unit, wherein the paper gripper includes an ejector 202 to be fixed, and a gripper 106 rotatably configured about a predetermined angle to the ejector 202 , and the paper gripper is configured to grip the several sheets of paper by the ejector 202 and the gripper 106 , further including a grip release unit configured to release a grip by the ejector 202 and the gripper 106.

The invention is claimed is: 
     
       1. A paper post-processing device comprising:
 a base tray configured to stack paper transferred from an image-forming device; 
 a paper transferring unit including
 a paper grip transfer means configured to grip and transfer a rear end of a paper bundle stacked on the base tray, and to release a grip in a discharge position to stack the paper bundle on the stacker tray, and 
 a paper guide transfer means configured to hold and transfer a rear end portion of several sheets of paper housed in the paper stacking plate; 
 
 a stacker tray configured to stack paper transferred from the paper transferring unit; and 
 a drive means configured to link the paper grip transfer means and the paper guide transfer means to be driven by a single drive source, 
 wherein the paper guide transfer means sets a position where the several sheets of paper housed on the paper stacking plate are aligned as an initial position to hold the paper, holds and transfers the rear end portion of the several sheets of paper to a grip position for gripping paper by the paper grip transfer means, and returns to the initial position at a timing of gripping and transferring the paper by the paper grip transfer means, or subsequently. 
 
     
     
       2. The paper post-processing device according to  claim 1 , wherein the paper guide transfer means is disposed on each side of the paper grip transfer means. 
     
     
       3. The paper post-processing device according to  claim 1 , comprising
 a pair of paper grip transfer means, 
 wherein the paper guide transfer means is disposed between the pair of paper grip transfer means. 
 
     
     
       4. The paper post-processing device according to  claim 1 ,
 wherein the paper guide transfer means includes an end fence configured to hold a rear end portion of paper, and 
 the drive means transfers the end fence by linking with the paper grip transfer means in the initial position, releases the linkage at a timing of gripping and transferring the paper by the paper grip transfer means, or subsequently, and returns the end fence to the initial position.